Connected: An Internet Encyclopedia
RFC 1035 - 2.3.4. Size limits

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### 2.3.4. Size limits

Various objects and parameters in the DNS have size limits. They are listed below. Some could be easily changed, others are more fundamental.

labels | 63 octets or less
names | 255 octets or less
TTL | positive values of a signed 32 bit number.
UDP messages | 512 octets or less

Next: 3. DOMAIN NAME SPACE AND RR DEFINITIONS

Connected: An Internet Encyclopedia
RFC 1035 - 2.3.4. Size limits